Driver and option support for -gsplit-dwarf. This is a part of
the DWARF5 split dwarf proposal.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174349 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Action.cpp b/lib/Driver/Action.cpp
index 2b5bbee..29f7ad2 100644
--- a/lib/Driver/Action.cpp
+++ b/lib/Driver/Action.cpp
@@ -33,6 +33,7 @@
   case LipoJobClass: return "lipo";
   case DsymutilJobClass: return "dsymutil";
   case VerifyJobClass: return "verify";
+  case SplitDebugJobClass: return "split-debug";
   }
 
   llvm_unreachable("invalid class");
@@ -119,3 +120,9 @@
 VerifyJobAction::VerifyJobAction(ActionList &Inputs, types::ID Type)
   : JobAction(VerifyJobClass, Inputs, Type) {
 }
+
+void SplitDebugJobAction::anchor() {}
+
+SplitDebugJobAction::SplitDebugJobAction(ActionList &Inputs, types::ID Type)
+  : JobAction(SplitDebugJobClass, Inputs, Type) {
+}